CONTENTS

 1     Introdution
 2     Scope
 3     Abbreviations
 4     Definitions
        4.1     Definitions related to services and network capabilities
        4.2     Definitions related to general ISDN interworking configurations
 5     Telecommunication services to be supported by ISDN interworking configurations
 6     ISDN interworking configurations
        6.1     Reference points for network interconnections
        6.2     ISDN-to-ISDN interconnection
        6.3     Interworking between ISDNs and other networks
        6.4     ISDN internal interworking
        6.5     Network concatenation configurations
 7     Interworking functional requirements – General aspects
        7.1     Categories of interworking functions
        7.2     Mapping principles
        7.3     Guidelines on the description of mapping functions
        7.4     Functional requirements for lower layer service interworking
        7.5     Functional requirements for higher layer service interworking
 8     General aspects of selection mechanisms for interworking functions